Apparatus for stretching a fabric

ABSTRACT

Apparatus for stretching fabric manufactured on weaving looms which permits a quick switching from using border temples to using whole width temples. A channel-shaped supporting ledge for temple holders is provided on the loom, the upwards pointing side walls of the ledge forming sliding guidings and a support for the stretched fabric, the recessed part of the supporting ledge accommodating the temple holders.

Apr. 2, 1974 United States Patent [1 1 Riha et al.

[ APPARATUS FOR STRETCHING A FABRIC FOREIGN PATENTS OR APPLICATIONS Switzerland.....................

.m m m a a uh r n "r. B waB mmum e e r ur GFAG 00000776 426650 999999 llllll 0007 749386 9700033 9 3 20879 59457 22227 Vsetin, Czechoslovakia Sept. 1, 1972 Primary ExaminerJames Kee Chi [22] Filed:

] ABSTRACT Apparatus for stretching fabric manufactured on 2| Appl. No.: 285,816

weaving looms which permits a quick switching from using border temples to using whole width temples. A channel-shaped supporting ledge for temple holders is 829 9B9 w 33% 10 aD/ 4 9 9 ,3 2 l0 WM Umm ll] 2 00 555 [ll [56] References Cited provided on the loom, the upwards pointing side walls UNITED STATES PATENTS of the ledge forming sliding guidings and a support for the stretched fabric, the recessed part of the supporting ledge accommodating the temple holders.

139/291 R Robertson...........;...... 139 294 2 Clams, 6 Drawmg Figures 1,536,827 5/1925 Draper............................ 1,052,417 2/1913 .lackson....... 1,477,977 12/1923 APPARATUS FOR STRETCHING A FABRIC BACKGROUND OF THE INVENTION This invention relates to a device for guiding the fabric on weaving looms and particularly to an arrangement for holding and stretching the fabric. A suitable holding and stretching of the fabric is particularly important for shuttleless looms, which are being more and more used in modern weaving methods.

This problem is solved for shuttle looms mostly by means of singleor two row temples for the fabric, which are adjusted to the correct position by adjusting an arm, the other end of which is fixed to the breast beam or to the frame of the loom. The lower system of threads contacts, for an open shed, the shuttle track on the slay, so that the adjustment of the shed for passage of the shuttle is correctly determined. Supporting ledges or other auxiliary devices are therefore seldom used for shuttle looms.

In the case of shuttleless looms, only some gripper looms have guiding tracks for the introduction of the needle for determination of the lower shed, whereas other shuttleless looms have the upper and lower system of threads of the shed determined solely by guiding in the heald eyes and at the beat-up point of the fabric. This freedom of determination of the shed is rather unfavorable for weaves having an unequal number of threads in both systems of the shed. It is possible to achieve a constant connecting point of the fabric for these weaves only in those places where the fabric is guided over temples, that is, at the borders of the fabric, whereas the central part of the fabric is deformed according to the shed system having the larger number of threads.

This drawback is generally eliminated by a supporting ledge which occupies the space between both temples and having its front edge approximately at the level of the front edge of the cover of the temples. This arrangement is suitable where the number of threads of the lower shed system is larger than that of the upper shed system. In the opposite case, in which the upper shed system has the larger number of threads, this supporting ledge has to be replaced by another ledge which presses the fabric downwardly.

These accessories serving for securing the position of the connecting point of the fabric are independent, replaceable elements. A consequence thereof is a reduced efficiency, since these elements have to be stored away from the loom, and, for changes of the woven fabric, substantially time losses are experienced due to the transport and proper adjustment of these auxiliary devices.

The said deformation of the fabric is in some cases eliminated by ring temples along the whole width of the fabric, that is, by temples extending over the whole width. This solution secures the position of the connecting point relatively well for all weaves. A substantial drawback is, however, that it cannot be used for all kinds of fabric.

SUMMARY OF THE INVENTION It is an object of this invention to reduce to a large extent the above-described difficulties by providing a supporting ledge for the temple holder having a channel-shaped profile, the upwards pointing side walls of which form a sliding guide and a support for the stretched fabric, whereby the side wall, over which the fabric is fed to the temple, forms a front supporting edge of the temple and the recessed part of the profile of the supporting ledge is adapted for the accommodation of a holder of an end of a full width temple.

7 DESCRIPTION OF THE DRAWINGS Exemplary embodiments of the object of this invention are shown in the attached drawings, where:

FIG. 1 is an elevation partly in section of a weaving loom with an arrangement for stretching of the woven fabric with a holder supporting a couple of temples provided with needles;

FIG. 2 is the corresponding top view;

FIG. 3 is a detail of a supporting ledge with a holder of border temples in cross-section;

FIG. 4 is an overall elevational view of an arrangement for stretching the fabric in its whole width with a longitudinal holder of a stretching rod;

FIG. 5 is a top view of the arrangement in FIG. 4, and

FIG. 6 is a detail of the arrangement of a supporting ledge with a holder of the stretching rod in crosssection.

DESCRIPTION OF PREFERRED EMBODIMENTS Tuming now to the drawings, a main part of the arrangement is a supporting ledge 1 (FIG. 3) of a channel profile, the length of which corresponds to the width of the fabric 2 (FIG. 1). The supporting ledge is fixed to a breast beam 3 of the weaving loom by screws 4 and, together with the breast beam, is adjustable in height. The screws 4 and holders 5 which are part of the supporting ledge 1 enable the disposition of the supporting ledge 1 in and against the direction of advance of the fabric 2. The side wall 1a of the supporting ledge 1 facing the reed 6 of the loom is narrowed in its rising part and at the end is rounded, so that it forms a sliding guide and a support for the advancing fabric 2. The more distant side wall 16 of the ledge 1 is reinforced and serves as a sliding guide and support for the taken off fabric 2 as shown in FIG. 1. The recessed part of the supporting ledge 1 has a T-shaped slot, housing form blocks 8 of corresponding shape, provided with threaded bores 9 for tightening screws 10. The bottom of the recessed part of the supporting ledge 1 forms a seat for a holder 11 of border temples 12 (FIGS. 1, 2, and 3) or for a holder 13 for full width temples, for instance a stretching rod 14 (FIGS. 4, 5). The holder 13 is designed as a through-going ledge having a length corresponding to that of the supporting ledge 1.

FIGS. 1 and 4 schematically show, for a better understanding, the arrangement of the object of this invention in conjunction with a weaving loom, such loom having a slay 15, a reed 6 fixed to the slay by screws 16, a warp l7, ledges 18 and 19 of the harness, a dividing rod 20, a take off roller 21, and a press roller 22 for the fabric 2.

The apparatus according to this invention permits a single common supporting ledge 1 to be used for both kinds of temples, that is, for border temples, and for full width temples, only the holder 11 and 13 being replaced depending upon the kind of temples used.

The configuration of the holder 11 for border temples l2 and its manner of fixing in the supporting ledge 1 are obvious from FIG. 3. The holder 11 is provided with recesses 23, in which supporting shafts 24 of border temples 12 are fixed by nuts 25, as shown in FIG.

2. The holder 11 is provided with a supporting stud 27 for the fabric 2 mounted in the direction toward the center of the fabric 2, the free end of said stud 27 being fixed by a tightening screw in the form block 8 located in the slot 7 of the supporting ledge 1.

As shown in FIGS. 4, 5, and 6, if instead of border temples 12 for the fabric 2, whole width temples have to be used for stretching the fabric over its whole width, for instance, stretching rods 14, it is merely necessary to remove the holder 1 l with the border temples 12, to replace them by the holder 13, and to insert into the space between the front part of the holder 13 and the adjacent side wall la of the supporting ledge 1 a stretching rod 14 or some other whole width temple, suitably anchored.

The guiding of the fabric 2 for both kinds of temples, that is, that of FIGS. 1-3, and 4-6, is obvious from the drawings.

It is in this case possible to use a whole width temple, represented by the stretching rod 14 simultaneously with the border temples 12.

The disclosed apparatus can be applied on all kinds of weaving machines, where it permits a quick and efficient switching to weaving with other kinds of binding.

Although the invention is illustrated and described with reference to a plurality of preferred embodiments, it is to be expressly understood that it is in no way limited to the disclosure of such a plurality of preferred embodiments, but is capable of numerous modifications within the scope of the appended claims.

What is claimed is:

1. Apparatus for stretching a fabric woven on a weaving loom, comprising in combination:

a breast beam of the weaving loom,

a supporting ledge mounted on the breast beam for adjustment with respect to the direction of advance of the fabric,

temple holders on the supporting ledge,

temples in said temple holders for stretching the fabthe supporting ledge being of channel shape, with a first side wall facing the fabric fed to the temples and a second side wall behind the first one, with a recessed part between both side walls,

the upper rounded extremities of both side walls of the supporting ledge forming sliding guides and supports for the stretched fabric,

the upper extremity of the first side wall forming a front supporting edge of the temple,

the recessed part of the supporting ledge accommodating said temple holders.

2. Apparatus as set forth in claim 1, wherein the recessed part of the supporting ledge is provided with at least one slot for the accommodation of a fastening means for a temple holder. 

1. Apparatus for stretching a fabric woven on a weaving loom, comprising in combination: a breast beam of the weaving loom, a supporting ledge mounted on the breast beam for adjustment with respect to the direction of advance of the fabric, temple holders on the supporting ledge, temples in said temple holders for stretching the fabric, the supporting ledge being of channel shape, with a first side wall facing the fabric fed to the temples and a second side wall behind the first one, with a recessed part between both side walls, the upper rounded extremities of both side walls of the supporting ledge forming sliding guides and supports for the stretched fabric, the upper extremity of the first side wall forming a front supporting edge of the temple, the recessed part of the supporting ledge accommodating said temple holders.
 2. Apparatus as set forth in claim 1, wherein the recessed part of the supporting ledge is provided with at least one slot for the accommodation of a fastening means for a temple holder. 